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arXiv 2212.05660astro-ph.GA
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我们能用空间积分的SED拟合来约束星系的几何参数吗?

Can we constrain galaxy geometry parameters using spatially integrated SED fitting?

Yisheng Qiu, Xi Kang, Yu Luo

摘要:

复杂的光谱能量分布(SED)模型使用几何参数描述粉尘衰减和排放。这种处理是自然的,因为尘埃效应是由星系中潜在的星尘几何形状驱动的。一个例子是星尘SED模型,它将星系分为恒星盘、恒星凸起和尘埃盘。这项工作利用Starduster SED模型研究的效力,推断几何参数使用空间集成SED拟合。我们的方法适合的SED模型,以模拟测光结合半解析模型与相同的SED模型。我们的拟合结果表明,即使使用了从UV到FIR的21个滤波器,星盘半径也可以被约束,而倾角、尘埃盘与星盘半径比、凸起半径和内禀凸起与总光度比都不受约束。我们还研究了S/N的影响,发现S/N的增加(高达80)带来有限的改善的结果。我们提供了一个详细的讨论来解释这些发现,并指出更一般的几何模型的影响。

英文摘要:

Sophisticated spectral energy distribution (SED) models describe dust attenuation and emission using geometry parameters. This treatment is natural since dust effects are driven by the underlying star-dust geometry in galaxies. An example is the Starduster SED model, which divides a galaxy into a stellar disk, a stellar bulge, and a dust disk. This work utilises the Starduster SED model to study the efficacy of inferring geometry parameters using spatially integrated SED fitting. Our method fits the SED model to mock photometry produced by combining a semi-analytic model with the same SED model. Our fitting results imply that the disk radius can be constrained, while the inclination angle, dust disk to stellar disk radius ratio, bulge radius and intrinsic bulge to total luminosity ratio are unconstrained, even though 21 filters from UV to FIR are used. We also study the impact of S/N, finding that the increase of S/N (up to 80) brings limited improvements to the results. We provide a detailed discussion to explain these findings, and point out the implications for models with more general geometry.

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